Motor-driven cutter for the cutting open of plaster casts

Abstract

In a motor-driven cutter for the cutting open of plaster casts with a motor housing, a fixed center blade and two oscillatingly motor-driven blades disposed either side of the fixed blade and both interacting with said fixed blade and moving the cutter forward along the cut, in order to prevent unitentional contacting of the blades, it is proposed that a cover hood be displaceably mounted on the motor housing and be displaced by a flexible force storage means into a position covering the three blades whereby the cover hood exhibits glide-on surfaces which, as the cutter is pushed forward, glide on the plaster, thereby displacing the cover hood against the action of the flexible force storage means into a position exposing the blades.

What is claimed is: 
     
       1. Motor-driven cutter for the cutting open of plaster casts with a motor housing, a fixed centre blade and two oscillatingly motor-driven blades disposed either side of the fixed blade and both interacting with said fixed blade and moving the cutter forward along the cut, comprising: a cover hood displaceably mounted on the motor housing having glide-on surfaces disposed to contact the plaster,   flexible force storage means that acts on said cover hood to displace it into a position covering the three blades whereby the cover hood presents the glide-on surfaces which, as the cutter is pushed forward, glide on the plaster and displace the cover hood against the action of the flexible force storage means into a position exposing the blades, said cover hood consisting of two shells of mirror image construction and having two parallel side walls which extend parallel to the blades and connect to a cross-wall on their sides facing away from the motor housing, and each said shell bearing a web directed toward the other shell whereby said webs are inserted in guide grooves on the motor housing.   
     
     
       2. Cutter as defined in claim 1, wherein the guide grooves (13, 14) are formed by a cross-sectionally T-shaped bar (10) on the motor housing (1), said bar bearing at each of its ends a face wall (11, 12) acting as a stop. 
     
     
       3. Cutter as defined in claim 2, wherein the glide-on surfaces are formed by two arc-shaped edges (29) on the underside of the side walls (21, 22). 
     
     
       4. Cutter as defined in claim 1, wherein the cover hood (18) is in the form of an L-shape whereby a first leg extends parallel to the direction of displacement of the cover hood mounting and provides the mounting on the motor housing (1) while the second leg on the underside of the motor housing (1) extends opposite to the cutting direction of the cutter. 
     
     
       5. Cutter as defined in claim 4, wherein the first leg becomes increasingly wider toward the other leg. 
     
     
       6. Cutter as defined in claim 5, wherein the second leg exhibits the glide-on surfaces (edges 29).